title: (E)-1-(2-Phenyl-diazen-2-ium-1-yl)naph-thalen-2-olate.
abstract: In the title zwitterionic compound, C16H12N2O, the dihedral angle between the phenyl ring and the naphthalene ring system is 17.85 (8)°; an intra-molecular N-H⋯O hydrogen bond occurs. In the crystal, π-π stacking is observed between naphthalene ring systems of adjacent mol-ecules, the centroid-centroid distance being 3.6486 (11) Å.
authors.affiliation: Unité de Recherche de Chimie de l'Environnement et Moléculaire Structurale (CHEMS), Département de Chimie, Université Mentouri de Constantine 1, 25000 Constantine, Algeria.
authors.forename: Hassiba
authors.initials: H
authors.lastname: Bougueria
authors.forename: Souheyla
authors.initials: S
authors.lastname: Chetioui
authors.forename: Issam
authors.initials: I
authors.lastname: Boudraa
authors.forename: Abd El Kader
authors.initials: Ael K
authors.lastname: Bouchoul
authors.forename: Salah Eddine
authors.initials: SE
authors.lastname: Bouaoud